The closed universe is compared to the surface of a(n) ________ in spacetime
Fill in the blank(s) with correct word
sphere
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How do astronomers know that the nuclei of some galaxies are active?
a. Their nuclei are much brighter than expected. b. The orbits of stars near the center of the galactic nuclei are faster than expected. c. The luminosity of the nuclei varies over time. d. The color of the nuclei is different than expected.
When two galaxies move very closely to each other, their ________ may dramatically rearrange their visible structures
Fill in the blank(s) with correct word
A rock is suspended from a scale reads 20.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A) 1.60 × 103 kg/m3 B) 2.50 × 103 kg/m3 C) 2.33 × 103 kg/m3 D) 3.00 × 103 kg/m3 E) 2.67 × 103 kg/m3
Success in science is mainly linked to emphasis on
A) experiments. B) luck. C) trial and error. D) philosophical discussions.